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Thanks for the interest.
The main language for .NET Micro Framework is managed C# code (altrough with some thinkering people got other .NET languages like VB.NET to work). Which is a powerfull yet easy to use language. In combination with Visual Studio this is what makes .NET Micro Framework unique.
The only drawback of this solution is that the managed code is interpreted while running. This takes some time. Therefore it isn’t as fast as running native code. The people at GHI found a solution for this called RLP.
I know there are more SHA classes arround for C# but I needed a class that I could incorporate in a program without licence/copyright problems so I’ve written my own class from scratch.
The class supports SHA-1, SHA-224 and SSH-256. The HMAC versions with key are also supported. The comments in the code are the same as the pseudocode found on the Wikipedia page about SHA helping to understand what the code is doing.
Demo code:
// Outputs: SHA-1: 6CD1F13BA07759CCB56D904C02C5509FCDEC30E2
Debug.Print(”SHA-1: ” + HexDisplay.bytesToHex(SHA.computeSHA1(
Encoding.UTF8.GetBytes(”The quick brown fox jumped up the fence and fell down”)
)));
// Outputs SHA-224: 475F234AC83E68834716DFF035A018AEFF5D575560B694EDD5FD40DE
Debug.Print(”SHA-224: ” + HexDisplay.bytesToHex(SHA.computeSHA224(
Encoding.UTF8.GetBytes(”The quick brown fox jumped up the fence and fell down”)
)));
// Outputs SHA-256: 8A1C5C14E24F5EA8F04061CA96A389DF77F838D0BEAD3253CFFEF8C880F912AA
Debug.Print(”SHA-256: ” + HexDisplay.bytesToHex(SHA.computeSHA256(
Encoding.UTF8.GetBytes(”The quick brown fox jumped up the fence and fell down”)
)));
// Outputs HMAC SHA-1: A31FBA759E7E25430CCC746800DFBA9926D3AAB9
Debug.Print(”HMAC SHA-1: ” + HexDisplay.bytesToHex(SHA.computeHMAC_SHA1(
Encoding.UTF8.GetBytes(”testkey”),
Encoding.UTF8.GetBytes(”The quick brown fox jumped up the fence and fell down”)
)));
// Outputs HMAC SHA-224: A36AA9599671BFA825BF8B1444F52E7266E4B0E2C30FD5D920EEA980
Debug.Print(”HMAC SHA-224: ” + HexDisplay.bytesToHex(SHA.computeHMAC_SHA224(
Encoding.UTF8.GetBytes(”testkey”),
Encoding.UTF8.GetBytes(”The quick brown fox jumped up the fence and fell down”)
)));
// Outputs HMAC SHA-256: 5AF95A03C056CED859AE31BB320BD620997544102BBFA487FB36CB4731B5A385
Debug.Print(”HMAC SHA-256: ” + HexDisplay.bytesToHex(SHA.computeHMAC_SHA256(
Encoding.UTF8.GetBytes(”testkey”),
Encoding.UTF8.GetBytes(”The quick brown fox jumped up the fence and fell down”)
)));
Download:
You can download the class with test program: MF_SHA.zip
Somebody asked if I could make a Twitter Client for .NET Micro Framework. Afcourse I said, so I started building and within a few hours it’s ready. A simple but yet usefull Twitter Client.
This Twitter client allows you to view your “friends” timeline. This is the timeline that you see when you go to your startpage. It’s shows your Twit’s and the Twit’s of the friends you follow.
The program consists of two parts. The Twitter library (It’s less fancy than it’s sound. It has only one function 
) and the WPF display program.
It has some known impovements and issues, as this program is something in between it’s your task to fix it if you want
Video:
You can whatch a Youtube video below. The interface is fluwent but Windows Media Encoder screwed it up a little. Maybe I will make a new version with my camera and a real device:
Download:
And last but not least you can download the code for Visual Studio 2008:
MFTwitterClient.zip
I want to write a simple but fun app that could showcase/test the functions of the new ChipworkX board. I tought of a simple ball game that could be controlled by moving the board. This is done trough the onboard BMA020 accelerator sensor.
It took me some time to figure out how to do the collision detection but I have an initial version ready. The idea of the game? You have to blast away the purple bricks in the game without touching the red bricks. I’ve done some testing and it’s harder then you think
The game isn’t ready yet. The video/source is as demonstration only! The red walls don’t harm you yet and there is only one level. When it’s finished I will upload it to microframeworkprojects.com
You can whatch a YouTube video below:
And download the Visual Studio 2008 solution:
MFBall.zip
ChipworkX development system
In the time that I have been away the .NET Micro Framework community made great progress. The first device running the new 4.0 framework beta comes from GHI Electronics. It’s called ChipworkX and has some impressive features:
With the RLP feature you can write native C++ code that can be called from .NET MF without using the MF porting kit (GHI has used this to make a MPEG decoder!) also a database system is provided in the form of a SQLite Database system.
You can find more information at the ChipworkX product page
Maybe everybody knows already but the Dare to Dream Different Challange finalists have been announced! Unfortunatly I’m not one of them but still I find it very cool that people put so much and usefull effort into their .NET Micro Framework project.
Here is the list of the finalists (from the contest website)
Hobbyiests
| Initial | Last Name | City | Country |
| A | Inochkin | Moscow | Russia |
| T | Fogg | Wallington | Australia |
| T | Scherrer | Novo Hamburgo | Brazil |
| R | Stropek | Traun | Austria |
| E | Percival | Hatfield | United Kingdom |
Professionals:
| Initial | Last Name | City | Country |
| G | Aasgaard | Bergen | Norway |
| D | Schaffer | Rockville, MD | United States of America |
| S | Vassiliev | Moscow | Russia |
| B | Fisher | Shiner, TX | United States of America |
| J | Ng | Seattle, WA | United States of America |
I whish everybody the best of luck and congatulations!!
Hi!
You may have noticed that I’ve been away for a while. But I’m back. Due to several problems with my landlord refusing to do necessary work on my appartment I’ve decided to move to my parents until I find a new appartment. Al the complications involved with this caused that I had very little time.
But I’ve been on holiday and have a lot of fresh energy! There have been a lot of developments in the mean time, some new MF products, Dare to Dream different finalists announced and a lot more. So I have to dive in these things, expect some more blog items soon!
Elze
I have a Meridan/P from Device Solutions but never given it a propper introduction. The Meridan/P has the same connections and powerfull functions as it’s bigger brother the Tahoe II but in a smaller package (50mm x 50mm). It lacks the screen and the ethernet connection but both can be added externaly should be needed. The pinout of the connectors match up with the connectors on the Tahoe II so converting your project to this new board is easy!
I use the Meridan/P in my HomeTerm project now as external temperature sensor. The baseboard (Tahoe II) is connected to the Meridan/P with Xbee. The Meridan/P also controls an RGB LED matrix allowing you to put the temperature sensor in sight. The baseboard sends the current time and external temperature from Yahoo Weather to the Meridan/P and in response to that it sends the current room temperature back.
I’ve been working on my Dare to Dream Different Challange for some time now. With the finish of this round comming a little closer (15th of May) I want to lift some of the secrecy thats surrounding it. In this article I’m telling about the idea, sourcecode is not released.
The idea of my project is based on geocaching. Geocaching is a game were the participants use a GPS reciever to search for tressures or “caches”. Each tressure contains information what to do next. Quoted from Wikipedia there are about 800 thousand geocaches registrated on different websites.
The name of my project is called DreamQuest. The first part of the name, “Dream”, comes from the name of the challange. The second part, “Quest”, comes from what this project provides: Quests.
A Quest is an combination of the following:
Quests are made on a website and can be shared among users. The .NET Micro Framework device is connected to internet trough GPRS with an GM862 from Telit. This enables users to download and start a quest everywhere.
The visibility of information, questions and POI is controlled by the associated basic program. I’ve written an Basic Intrepeter for .NET Micro Framework (MFBasic) for this purpose. Besides access to the items that make up the quest, the Basic program also has access to the current GPS location and time.
With Basic controlling the visibility of information, questions and POI can be triggered with a host of different triggers, not limited to:
By showing more and more items with different triggeres an adventure or “Quest” can be held without putting things in the ground but the element of supprise and not knowing what will happen next still existing.
When a user is doing a Quest, a score is calculated, so participants can compete with each other for the highscore enabling the social element.
Also tracking is supported so that you can see the track that you have made while doing a quest.
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